I have an idea about an amorphic parasite that would eat and then take the place of your arm without you realizing it. After a while it would eventually start either thinking on it's own or having babies or something. I want to know if it's been done before I get too committed to a draft.

Ok, idea shot down. Thanks. I'm not in a position to get on chat ATM. Also I assumed that doing a search of one obscure topic on all the articles would be difficult and perhaps somebody knew it off the top of their head. Granted I was wrong and if I had just read the article titles I would've had my answer when I reached 150. Thank you.